John Karlik 661-868-6220 jfkarlik@ucanr.edu
The goal of environmental horticulture is to preserve and enhance the environment through planting and proper cultural practices for green plants, including shade trees, shrubs, and turfgrass. Environmental science includes preservation and enhancement of environmental quality of soil, water and air. Kern County is a leader in the U.S. in production of rose plants for landscapes and home grounds.
Cooperative Extension provides information on turfgrass, plant selection, cultural practices, arboriculture, landscape maintenance, and pest management.
Rose Rosette Disease Information
Rose Rosette Disease Demystified
Managing Rose Rosette Disease in the Landscape
Updated Shade and Ornamental Tree Guide for Kern County
This updated guide was revised and expanded in April 2017. You can download the Guide here.
Updated Shrub and Groundcover Guide for Kern County
This updated guide was revised and expanded in August 2020. You can download the Guide here.
Horticulture Classes for Landscapes, Gardens, and Orchards
We continue to offer a series of horticulture classes in Bakersfield and Kern County. Our goals are to conserve water, to enhance and expand green plantings, and to reduce pesticide applications. We will cover practical topics pertaining to planting and care of landscapes, orchards, and vegetable gardens, and offer plenty of time for Q&A and discussion. We welcome individuals who have little horticulture experience, as well as those who work in some aspect of horticulture. Please refer to the UC Master Gardeners of Kern tab on the left side of this page.
Horticulture Tours
I have offered several horticultural tours, and plan to continue this educational effort. Our heritage of landscape and garden design includes the rich tradition of gardens of several parts of the world, including Europe and the Mediterranean, and some of the world's most interesting and beautiful plant arrangements and collections may be found there. A number of gardens and landscapes exquisitely illustrate design principles and have withstood the test of time. These sights are well worth sharing.
The overall tour objective is to broaden participants' knowledge and appreciation for landscape design and plant selection. The tour also provides an opportunity to experience the flavor of specific countries. Group sizes have ranged from nine to twenty-six.
Past Horticulture Tours
2005 England (London environs) and France (Paris environs)
2006 Italy (Lago di Como, Florence, Rome, Pompeii)
2007 West-Central Europe (Netherlands, Berlin, Prague, Vienna)
2009 England and Scotland (northeast)
2010 Spain
2012 France and the Netherlands
2013 Ireland
2014 Scotland (northwest)
2017 Iceland
2019 Thailand and Cambodia
Research Projects
Green plants contribute volatile organic compounds (VOC) which can enter into atmospheric reactions that form ozone (a pollutant when found close to the Earth’s surface) and secondary organic aerosols. We have conducted a number of research projects pertaining to development of biogenic emission inventories, including measurement of plant VOC emission rates, leaf mass quantification, and evaluation of databases for plant species description. This work also informs shade tree selection for mass planting programs to enhance air quality.